Privacy Policy

Last updated: July 22, 2026

This Privacy Policy explains what information Calculator Index ("we," "us," "our") collects when you visit this website, how it is used, and the choices you have.

The short version

• Your calculator inputs never leave your device. All calculations run entirely in your browser. We do not receive, store, or transmit the numbers you enter.
• We do not require accounts and do not collect names, email addresses, or other personal information unless you contact us voluntarily.
• Like most free websites, we display advertising, and our advertising partners may use cookies to serve ads. You can opt out of personalized ads (details below).

Information we collect

Calculator inputs

None. Every calculator on this site performs its computation locally in your browser using JavaScript. Nothing you type into a calculator is sent to our servers or to any third party by us.

Server logs

Our hosting provider may automatically record standard technical information when you visit, such as your IP address, browser type, the pages you view, and the date and time of your visit. This information is used for security and to keep the site running, not to identify you personally.

Contact

If you email us, we receive your email address and the contents of your message. We use them only to respond to you.

Advertising and cookies

We use third-party advertising, including Google AdSense, to keep the site free.

• Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website and other websites.
• Google's use of advertising cookies (such as the DoubleClick cookie) enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet.
• You may opt out of personalized advertising by visiting Google Ads Settings. You can also opt out of many third-party vendors' cookies at www.aboutads.info.

Where required by law (for example, for visitors from the EEA or UK), a consent mechanism will be shown before advertising cookies are set, and personalized ads will only be shown with your consent.

Analytics

We may use privacy-respecting analytics to understand aggregate traffic (for example, which calculators are most used). Analytics data is aggregated and is not used to identify individual visitors.

Children's privacy

This site is a general-audience website and does not knowingly collect personal information from children under 13.

Your rights

Depending on where you live, you may have rights to access, correct, or delete personal data. Because we collect almost no personal data, in most cases there is nothing for us to access or delete — but if you have any question or request, contact us and we will respond.

Changes to this policy

If we change this policy, we will update the date at the top of this page. Material changes will be noted on this page.

Contact

Questions about this policy? Contact us.